1005343121 has 4 divisors (see below), whose sum is σ = 1005428592. Its totient is φ = 1005257652.

The previous prime is 1005343091. The next prime is 1005343159. The reversal of 1005343121 is 1213435001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1005343121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1005343093 and 1005343102.

It is not an unprimeable number, because it can be changed into a prime (1005340121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21611 + ... + 49776.

It is an arithmetic number, because the mean of its divisors is an integer number (251357148).

Almost surely, 2^1005343121 is an apocalyptic number.

It is an amenable number.

1005343121 is a deficient number, since it is larger than the sum of its proper divisors (85471).

1005343121 is an equidigital number, since it uses as much as digits as its factorization.

1005343121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85470.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1005343121 is about 31707.1462134327. The cubic root of 1005343121 is about 1001.7778776113. Note that the first 3 decimals are identical.

Adding to 1005343121 its reverse (1213435001), we get a palindrome (2218778122).

The spelling of 1005343121 in words is "one billion, five million, three hundred forty-three thousand, one hundred twenty-one".